Self-centering punch.



iinrnrrr @errent BURTON H. CLEME'I AND GEORGE A. CLEMENT, OF BELOXT,W'ISGONSIN.

SELF-CNTEilirfiG PUNCH..

SPECIEICATIGN forming part of Letters PatentNc. 718,427, dated January13, 1903. Application filed February 2B, 1902. Serial No. 96,055. (Nomodel.)

To all whom it may concern:

Be it' known that we, BURTON H. CLEMENT and Geenen A. CLEMENT, citizensof the United States, residing at Beloit, county of Rock, and State ofWisconsin, have invented new and useful Improvements in Self-CenteringPunches, of which the following is a' Fig. 2 is a longitudinal sectionalView of the4 saine. Fig. is a view of the lower end. Fig.

fi is a sectional view drawn on line to in of Fig. Fig. 5 is a detailside view of one of the jaws and jaw-supporting arms.

Like parts are identified by the same4 re ference characters throughoutthe several views.

In the drawings, 1 is the'punch. 2 isa tubular guide therefor, providedwith circular disks or head-flanges 3 and Li at or near its lower end.

5 represents centering-jawswhich connect with an arin C, which ispivoted at 7 between the head-flanges 3 and 4, the arin (i and jaws 5being in the forni of a forked piece of metal, Fig. 5, with the jaw-armof the fork bent, as best shown in Fig. 3, the jaws being so formed thatwhen the arms (i are folded into proxiniity with the adjacent pivots, asindicated by dotted lines in Fig. 23, the jaws 5 will moet in the centerline of the punch 1, the jaws being retracted from this position byswinging the arms l outwardly until such arms cxtend radially from thecommon center, as also shown in Fig. In o'rder to actuate all the jawssimultaneously and equally,we have pro having diagonal open-endedguide-slots 9, through which the arms 6 of the jaws pass. \Vhen the ringS is moved in the direction indicated bythe arrows in Fig. 3, the armsL3 of the jaws wili be carried around to the folded position shown linldotted lines in said ligure and the jaws brought into central contact,as above stated.

By rotating the ring in the opposite direction, however, the jaws areretracted until the arms 6 thereof are adjusted in radial lines.

. Aspiral spring 15 is coiled around the'guide Q'within the collar S,one end'of the spring being secured to the head-flange e and the otherbeing secured to the collar, as best .shown i'i Fig. 2, the spring beingarranged to The ring 8 is held in position by means of a sleeve 16,enlarged to form an annular bearing at 17 for the ring 8. The latteralso has a bearing' upon the head-flange4. The sleeve 1G is secured tothe guide 2 bya set-screw 18, whichvalso engages in -a channel' orrecess 19 in the punch 1, whereby the latter is permitfroin turning or`dropping out of position.

the ring S and sleeve 1G upon each other, both being 'milled or knul-ledto facilitate `such manipulation, the ring being turned in the directionindicated by the arrows in Fig. 3 or an equivalent movement being'imparted to the sleevelG in the opposite direction, whereupon the jawswill be retracted to their open position. Work can then be insertedbetween the jaws, when on releasing the ring 8 the reaction ,of spring15 jaws upon the work, and as the jaws are all equally actuated toward acommon center the wt i rwill be breng-ht to an exact central position. Ablow upon the punch .1 is then administered, causing the point ofthepunch to dent ihe work exactly in the center.-

Having thusdescribed our invention, what we claim as new, and desire tosecure by Letters Patent, is-

1. The combination with a punch; of a tu-l bular guide therefor,provided with circular disks or head-flanges near one end; arms pivotcdbetween the head-flanges; centering-jaws 4ope1""'ng beyond saidhead-flangesand connected with said` arms; and a ring rotatablys'rpported upon the head-flanges, and provided with slots in which saidarms are eni gaged'.

2. The combination with a centeringpuneh;-

of aguide therefor; a set of centering-jaws connected with the guide; ajaw-adjusting ringhaving guide=slots, and operatively eqn- 1 nected withthe jaw; and a spring arranged operates to close theA hold the jawsnormally in closed position.

bd a limited movement, but is prevented .7o In use the jaws are openedwhen rotating...

r, to aetuate eaid ri g to close the jaws upon the axial line oi' tl lpunch.

The combination of a centering-punch and tubular guide therefor,provided with 5 head-flanges near one end; arms extending between saidhead-flanges, and pivotally secured thereto; centering-jaws connectedwith said arms; a jaw-adjieting ring; rotatably mounted on Saidheaddanges, and provided 1o With diagonal guide-slots; in which thejawarms are engaged.

L The combination of a centering-punch and tubular guide therefor,provided with head-flanges near one end; arme extending l5 between saidheadfanges, and pivotally Secured thereto; centering-jaws connected withsaid arms; a jaweadjusting ring rotatably mounted on Said head-flanges,and ,provided with diagonal guide-Siete, in which the jawzo arms areengaged, `aid jaws extending: in the direction of ring rotation at anangle to the ljmwarm.

VThe combination of a tubular guide; a.

exiterng-pznch mounted for limited longi- 25 tudinal movement therein; asetof centeringjaws, pvotally connected with the guide; and aspringadapted to hold said ring normally in position With the jaws in contactin the axial line of the punch. l

G. The combination of a tubular guide, pro'- vided with circularhead-flanges at one end;

centering-jaws having arms pivotally secured between said head-flanges;an adjusting-ring having open-ended guide-slots adapted to receive saidarms; a holder-sleeve rigidly connected with the guide; a punch mountedfor longitudinal movement in the guide;` said holder-sleeve andhead-Haugen forming annu-

